How can I import an obj sequence into blender?
There is a patch for Blender allowing you to use RealFlow .bin files inside blender.

https://developer.blender.org/T41935

However it looks like the patch is no longer in development, due to alembic support coming very soon.

see: http://lists.blender.org/pipermail/bf-committers/2015-March/045025.html